Videos/Webcasts:

YouTube and Vimeo have both been positively reviewed for their accessibility features

Other:

SensusAccess at Berkeley: SensusAccess is a campus-provided tool for self-service conversion of documents into a range of alternative formats including mp3, e-books, Braille, and Daisy. The service can also be used to convert otherwise inaccessible documents such as image-only PDF files, scanned images, lecture notes or other educational material into more accessible formats.